import auth from '@/plugins/auth'
import router, {asyncRoutes, constantRoutes} from '@/router'
import {getRouters} from '@/api/menu'
import Layout from '@/layout/index'
import ParentView from '@/components/ParentView'
import InnerLink from '@/layout/components/InnerLink'

const state = {
    routes: [],
    addRoutes: [],
    defaultRoutes: [],
    topbarRouters: [],
    sidebarRouters: []
}

const mutations = {
    SET_ROUTES: (state, routes) => {
        state.addRoutes = routes
        state.routes = constantRoutes.concat(routes)
    },
    SET_DEFAULT_ROUTES: (state, routes) => {
        state.defaultRoutes = constantRoutes.concat(routes)
    },
    SET_TOPBAR_ROUTES: (state, routes) => {
        state.topbarRouters = routes
    },
    SET_SIDEBAR_ROUTERS: (state, routes) => {
        state.sidebarRouters = routes
    },
}
const actions = {
    // 生成路由
    GenerateRoutes({commit}) {
        return new Promise(resolve => {
            // 向后端请求路由数据
            getRouters().then(res => {
                const sdata = JSON.parse(JSON.stringify(res.data))
                const rdata = JSON.parse(JSON.stringify(res.data))
                const sidebarRoutes = filterAsyncRouter(sdata)
                const rewriteRoutes = filterAsyncRouter(rdata, false, true)
                const dynamicRoutes = filterDynamicRoutes(asyncRoutes);
                // rewriteRoutes.push({path: '*', redirect: '/404', hidden: true})
                dynamicRoutes.forEach(dynamicRoute => {
                    router.addRoute(dynamicRoute);
                })
                commit('SET_ROUTES', rewriteRoutes)
                commit('SET_SIDEBAR_ROUTERS', constantRoutes.concat(sidebarRoutes))
                commit('SET_DEFAULT_ROUTES', sidebarRoutes)
                commit('SET_TOPBAR_ROUTES', sidebarRoutes)
                resolve(rewriteRoutes)
            })
        })
    }
}

const getters = {
    permission_routes: state => state.routes,
    topbarRouters: state => state.topbarRouters,
    defaultRoutes: state => state.defaultRoutes,
    sidebarRouters: state => state.sidebarRouters,
}

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap, lastRouter = false, type = false) {
    const newAsyncRouterMap = JSON.parse(JSON.stringify(asyncRouterMap))
    return newAsyncRouterMap.filter(route => {
        if (type && route.children) {
            route.children = filterChildren(route.children)
        }
        if (route.component) {
            // Layout ParentView 组件特殊处理
            if (route.component === 'Layout') {
                route.component = Layout
            } else if (route.component === 'ParentView') {
                route.component = ParentView
            } else if (route.component === 'InnerLink') {
                route.component = InnerLink
            } else {
                route.oldPath = JSON.parse(JSON.stringify(route.path))
                route.path = '/' + route.path
                // 设置 redirect 字段，假设没有 `redirect` 的话就生成
                if (!route.onlySelf) {  // 如果没有 redirect 字段，则添加
                    route.onlySelf = route.path + route.path;  // 设置 redirect 字段
                }
            }
        }
        if (route.children != null && route.children && route.children.length) {
            route.children = filterAsyncRouter(route.children, route, type)
        } else {
            delete route['children']
            delete route['redirect']
        }
        if (route.onlySelf && !route.children) {
            route.redirect = route.onlySelf
            route.children = [{
                path: route.oldPath,
                name: route.name + '-' + route.oldPath,
                component: loadView(route.component),
                meta: {
                    title: route.title,
                    sidebar: false,
                    activeMenu: '/' + route.oldPath
                }
            }]
            route.component = Layout
        }
        return true
    })
}

function filterChildren(childrenMap, lastRouter = false) {
    var children = []
    childrenMap.forEach((el, index) => {
        if (el.children && el.children.length) {
            if (el.component === 'ParentView' && !lastRouter) {
                el.children.forEach(c => {
                    c.path = el.path + '/' + c.path
                    if (c.children && c.children.length) {
                        children = children.concat(filterChildren(c.children, c))
                        return
                    }
                    children.push(c)
                })
                return
            }
        }
        if (lastRouter) {
            el.path = lastRouter.path + '/' + el.path
            if (el.children && el.children.length) {
                children = children.concat(filterChildren(el.children, el))
                return
            }
        }
        children = children.concat(el)
    })
    return children
}

// 动态路由遍历，验证是否具备权限
export function filterDynamicRoutes(routes) {
    const res = []
    routes.forEach(route => {
        if (route.permissions) {
            if (auth.hasPermiOr(route.permissions)) {
                res.push(route)
            }
        } else if (route.roles) {
            if (auth.hasRoleOr(route.roles)) {
                res.push(route)
            }
        }
    })
    return res
}

export const loadView = (view) => {
    if (process.env.NODE_ENV === 'development') {
        return (resolve) => require([`@/views/${view}`], resolve)
    } else {
        // 使用 import 实现生产环境的路由懒加载
        return () => import(`@/views/${view}`)
    }
}

export default {
    namespaced: true,
    state,
    actions,
    getters,
    mutations
}
